25 µg/L 8260 MegaMix Revised on Rtx-VMS

	Peaks
1.	Diethyl ether
2.	1,1-Dichloroethene
3.	Trichlorotrifluoroethane
4.	Carbon disulfide
5.	Iodomethane
6.	Allyl chloride
7.	Methylene chloride
8.	trans-1,2-Dichloroethene
9.	Acetonitrile
10.	Chloroprene
11.	1,1-Dichloroethane
12.	Acrylonitrile
13.	cis-1,2-Dichloroethene
14.	2,2-Dichloropropane
15.	Bromochloromethane
16.	Chloroform
17.	Carbon tetrachloride
18.	Methyl acrylate
19.	Tetrahydrofuran
20.	Dibromofluoromethane (SS)
21.	1,1,1-Trichloroethane
22.	1,1-Dichloropropene
23.	Benzene
24.	Propionitrile
25.	Methacrylonitrile
26.	Pentafluorobenzene (IS)
27.	1,2-Dichloroethane

	Peaks
28.	Isobutyl alcohol*
29.	Trichloroethene
30.	1,4-Difluorobenzene (IS)
31.	Dibromomethane
32.	1,2-Dichloropropane
33.	Bromodichloromethane
34.	Methyl methacrylate
35.	1,4-Dioxane*
36.	2-Chloropropanol*
37.	cis-1,3-Dichloropropene
38.	Toluene-d8 (SS)
39.	Toluene
40.	2-Nitropropane
41.	Tetrachloroethene
42.	trans-1,3-Dichloropropene
43.	1,1,2-Trichloroethane
44.	Ethyl methacrylate
45.	Dibromochloromethane
46.	1,3-Dichloropropane
47.	1,2-Dibromoethane
48.	Chlorobenzene-d5 (IS)
49.	Chlorobenzene
50.	Ethylbenzene
51.	1,1,1,2-Tetrachloroethane
52.	m-Xylene
53.	p-Xylene
54.	o-Xylene

	Peaks
55.	Styrene
56.	Bromoform
57.	Isopropylbenzene
58.	1-Bromo-4-fluorobenzene (BFB) (IS)
59.	cis-1,4-Dichloro-2-butene
60.	n-Propylbenzene
61.	Bromobenzene
62.	1,1,2,2-Tetrachloroethane
63.	2-Chlorotoluene
64.	1,3,5-Trimethylbenzene
65.	1,2,3-Trichloropropane
66.	trans-1,4-Dichloro-2-butene
67.	4-Chlorotoluene
68.	tert-Butylbenzene
69.	1,2,4-Trimethylbenzene
70.	sec-Butylbenzene
71.	p-Isopropyltoluene
72.	1,3-Dichlorobenzene
73.	1,4-Dichlorobenzene-d4 (IS)
74.	1,4-Dichlorobenzene
75.	n-Butylbenzene
76.	1,2-Dichlorobenzene
77.	1,2-Dibromo-3-Chloropropane
78.	Nitrobenzene
79.	Hexachlorobutadiene
80.	1,2,4-Trichlorobenzene
81.	Naphthalene
82.	1,2,3-Trichlorobenzene

*Note: these compounds were not detected at 25 ppb when the sample was analyzed via unheated purge.

Oven
Column	Rtx-VMS, 30 m, 0.25 mm ID, 1.40 µm (cat.# 19915)
Sample	8260B MegaMix calibration mix, revised (cat.# 30152)
	8260 Internal standard mix (cat.# 30074)
	8260 Surrogate mix (cat.# 30073)
Diluent:	Reverse-osmosis water
Conc.:	25 µg/L (5 mL sample)
Injection	purge and trap split
Liner:	Premium 1 mm Split (cat.# 23333.1)
Purge and Trap
Instrument:	EST Encon
Trap Type:	Vocarb 3000
Purge:	11 min, flow 40 mL/min
Dry Purge:	3 min, flow 40 mL/min
Desorb Preheat Temp.:	255 °C
Desorb:	1.0 min @ 260 °C, flow 30.9 mL/min
Bake:	6 min @ 260 °C
Interface Connection:	injection port
Transfer Line Temp.:	150 °C
Oven Temp.:	45 °C (hold 4.5 min) to 100 °C at 12 °C/min to 240 °C at 25 °C/min (hold 1.32 min)
Carrier Gas	He, constant flow
Flow Rate:	0.9 mL/min

Detector

Mode:

Scan

Scan Program:

Group	Start Time (min)	Scan Range (amu)	Scan Rate (scans/sec)
1	1.7	47-300	5.4
2	2.9	35-300	5.2

Transfer Line Temp.:

230 °C

Analyzer Type:

Quadrupole

Source Type:

Inert

Drawout Plate:

6mm ID

Source Temp.:

230 °C

Quad Temp.:

150 °C

Electron Energy:

70 eV

Solvent Delay Time:

1.5 min

Instrument

Agilent 7890A GC & 5975C MSD

Notes

Some purge-and-trap instruments show increased activity of dehydrohalogenate pentachloroethane during analysis, forming tetrachloroethene (also known as perchloroethylene, PCE). Symptoms of this problem are poor matching of PCE levels between sources or a PCE single analyte test. This revised 8260 MegaMix standard is identical to the original, minus pentachloroethane, and was made for testing that does not required reporting of pentachloroethane.